I will add that judging and persecuting others is also a "sin". Live and let live, I say.
Do I find homosecks gross...yep. Do I condemn them... nope, it's their thing. What right as a person do I have to judge others? Let God sort them out.
Like Jumbo said, if they want to get married, let them. It doesn't affect me, if they want to be equally miserable.